463 lines
14 KiB
JavaScript
463 lines
14 KiB
JavaScript
'use strict';
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function convertCoordsFromPicToUI(x,y, pic) {
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const picRect = pic.element.getBoundingClientRect();
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const workspaceRect = document.getElementById('workspace').getBoundingClientRect();
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// Scale the point
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const scaledX = x * pic.scale;
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const scaledY = y * pic.scale;
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// Translate the point based on the pic's position in the workspace
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const uiX = picRect.left - workspaceRect.left + scaledX;
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const uiY = picRect.top - workspaceRect.top + scaledY;
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return { x: uiX, y: uiY };
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}
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function convertCoordsFromUIToPic(x,y, pic) {
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const picRect = pic.element.getBoundingClientRect();
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const workspaceRect = document.getElementById('workspace').getBoundingClientRect();
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// Translate the point to the pic's coordinate system
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const picX = x - (picRect.left - workspaceRect.left);
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const picY = y - (picRect.top - workspaceRect.top);
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// Scale the point based on the pic's scale
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const scaledX = picX / pic.scale;
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const scaledY = picY / pic.scale;
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return { x: scaledX, y: scaledY };
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}
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function initUICanvas() {
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const uiCanvas = document.createElement('canvas');
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uiCanvas.id = 'uiCanvas';
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uiCanvas.style.position = 'absolute';
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uiCanvas.style.left = '0';
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uiCanvas.style.top = '0';
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uiCanvas.style.zIndex = '101'; // Ensure it's above other elements
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const workspace = document.getElementById('workspace');
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workspace.appendChild(uiCanvas);
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const resizeCanvas = () => {
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uiCanvas.width = workspace.clientWidth;
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uiCanvas.height = workspace.clientHeight;
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};
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// Initial resize
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resizeCanvas();
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// Resize canvas when window resizes
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window.addEventListener('resize', resizeCanvas);
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uiCanvas.addEventListener('mousedown', (event) => handleMouseEvent(event, 'mousedown'));
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uiCanvas.addEventListener('mouseup', (event) => handleMouseEvent(event, 'mouseup'));
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uiCanvas.addEventListener('mousemove', (event) => handleMouseEvent(event, 'mousemove'));
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uiCanvas.addEventListener('contextmenu', (event) => event.preventDefault());
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function handleMouseEvent(event, eventType) {
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if (tool.eventHandlers) {
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if ((event.buttons&4)==4) {
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passEventToElementBelow(event);
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}else {
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if (tool.eventHandlers[eventType]) {
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// Call the tool's event handler
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tool.eventHandlers[eventType](event);
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}
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}
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} else {
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// Pass the event to the element below
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passEventToElementBelow(event);
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}
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event.preventDefault();
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}
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function passEventToElementBelow(event) {
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uiCanvas.style.pointerEvents = 'none';
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// Find the element below the cursor
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let elemBelow = document.elementFromPoint(event.clientX, event.clientY);
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uiCanvas.style.pointerEvents = '';
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// Dispatch the event to the element below
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if (elemBelow) {
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forwardEvent(event,elemBelow);
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}
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}
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return uiCanvas;
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}
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function drawPicFramesOnUICanvas(uiCanvas, picList) {
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const ctx = uiCanvas.getContext('2d');
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ctx.clearRect(0, 0, uiCanvas.width, uiCanvas.height); // Clear the canvas
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picList.forEach(pic => {
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// Convert pic's corners to UI Canvas coordinates
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const topLeft = convertCoordsFromPicToUI(0, 0, pic);
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const topRight = convertCoordsFromPicToUI(pic.width, 0, pic);
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const bottomLeft = convertCoordsFromPicToUI(0, pic.height, pic);
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const bottomRight = convertCoordsFromPicToUI(pic.width, pic.height, pic);
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// Draw rectangle
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ctx.beginPath();
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ctx.moveTo(topLeft.x,topLeft.y);
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ctx.lineTo(topRight.x,topRight.y);
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ctx.lineTo(bottomRight.x,bottomRight.y);
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ctx.lineTo(bottomLeft.x,bottomLeft.y);
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ctx.lineTo(topLeft.x,topLeft.y);
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ctx.strokeStyle = 'red';
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ctx.stroke();
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// Draw cross lines
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ctx.beginPath();
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ctx.moveTo(topLeft.x, topLeft.y);
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ctx.lineTo(bottomRight.x, bottomRight.y);
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ctx.moveTo(topRight.x, topRight.y);
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ctx.lineTo(bottomLeft.x, bottomLeft.y);
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ctx.stroke();
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});
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}
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const pixelTip = {
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drawOperation (ctx,toolInfo,strokePath) {
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ctx.fillStyle=toolInfo.colour;
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for (let {x,y} of strokePath) {
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x=Math.floor(x-0.25);
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y=Math.floor(y-0.25);
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ctx.fillRect(x,y,1,1);
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};
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}
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}
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const eyeDropper={
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drawOperation(ctx,toolInfo,strokePath) {
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const last = strokePath.at(-1);
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let {x,y} = last;
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x=Math.floor(x-0.25);
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y=Math.floor(y-0.25);
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let canvas = ctx.canvas;
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if (x>=0 && y>=0 && x<canvas.width && y<canvas.height) {
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const sample = activePic.canvas.ctx.getImageData(x,y,1,1).data;
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const toHex = (byte) => byte.toString(16).padStart(2, '0');
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const color= "#" + toHex(sample[0]) + toHex(sample[1]) + toHex(sample[2]);
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$("#foreground").val(color)
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}
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},
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eventHandlers: {
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mousedown(e) {
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const {offsetX,offsetY} = e;
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const pic = getDrawAreaAtPoint(offsetX,offsetY);
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if (!pic) return;
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const {x,y} = convertCoordsFromUIToPic(offsetX,offsetY,pic);
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if (x>=0 && y>=0 && x<pic.width && y<pic.height) {
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const sample = pic.canvas.ctx.getImageData(x,y,1,1).data;
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const toHex = (byte) => byte.toString(16).padStart(2, '0');
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const color= "#" + toHex(sample[0]) + toHex(sample[1]) + toHex(sample[2]);
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$("#foreground").val(color)
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}
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console.log({x,y})
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}
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}
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}
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const feltTip={
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drawOperation(ctx,toolInfo,strokePath) {
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ctx.lineWidth=toolInfo.size;
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ctx.strokeStyle=toolInfo.colour;
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ctx.lineCap="round";
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ctx.lineJoin="round";
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ctx.beginPath();
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for (let {x,y} of strokePath) {
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ctx.lineTo(x,y);
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}
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ctx.stroke();
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},
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cursorFunction : circleBrush
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}
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const eraserTip={
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drawOperation (ctx,toolInfo,strokePath) {
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ctx.save();
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ctx.lineWidth=toolInfo.size;
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ctx.strokeStyle="white";
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ctx.lineCap="round";
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ctx.lineJoin="round";
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ctx.globalCompositeOperation="destination-out";
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ctx.beginPath();
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for (let {x,y} of strokePath) {
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ctx.lineTo(x,y);
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}
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ctx.stroke();
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ctx.restore();
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},
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cursorFunction :circleBrush
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}
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const pixelClear = {
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drawOperation(ctx,toolInfo,strokePath) {
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let x=Math.floor(toolInfo.x-0.25);
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let y=Math.floor(toolInfo.y-0.25);
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ctx.clearRect(x,y,1,1);
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for (let {x,y} of strokePath) {
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x=Math.floor(x-0.25);
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y=Math.floor(y-0.25);
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ctx.clearRect(x,y,1,1);
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};
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}
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}
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const transformTool = (_=> { //closure
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let rotateMode = false;
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let doubleClickGap=300;
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let mouseDownTime =0;
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let mouseDownTransform = [1,0, 0,1, 0,0];
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let mouseDownAngle = 0;
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let layer;
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let dragHandler;
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let mouseDownPosition
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let preserveAspect = false;
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let moved = false;
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let scaleHandlers= [
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dragTopLeft,dragTopRight,dragBottomRight,dragBottomLeft,dragTop,dragRight,dragBottom,dragLeft
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];
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const tool = {
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init() {
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rotateMode=false;
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this.drawUI();
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},
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drawOperation() {
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console.log("transform tool should not draw, this is a bug")
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},
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drawUI() {
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//drawPicFramesOnUICanvas(uiCanvas,[activePic]);
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const ctx=uiCanvas.getContext("2d");
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ctx.clearRect(0,0,1e5,1e5);
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let handles=controlPoints(0,0,activePic.activeLayer.width,activePic.activeLayer.height);
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ctx.fillStyle="black";
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ctx.strokeStyle="white";
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if (rotateMode) {
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let {x,y} = activePic.activeLayer.rotationCenter;
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const picPoints = activePic.activeLayer.convertToPicCoords(x,y)
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const uiPos = convertCoordsFromPicToUI(picPoints.x,picPoints.y,activePic);
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ctx.strokeStyle="black";
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ctx.strokeRect(uiPos.x-5,uiPos.y-5,10,10);
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ctx.strokeStyle="white";
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ctx.strokeRect(uiPos.x-4,uiPos.y-4,8,8);
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for (let{x,y} of handles) {
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const picPoints = activePic.activeLayer.convertToPicCoords(x,y)
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const uiPos = convertCoordsFromPicToUI(picPoints.x,picPoints.y,activePic);
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ctx.beginPath();
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ctx.arc(uiPos.x,uiPos.y,8,0,Math.PI*2);
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ctx.fill();
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ctx.beginPath();
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ctx.arc(uiPos.x,uiPos.y,7,0,Math.PI*2);
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ctx.stroke();
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}
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} else {
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for (let{x,y} of handles) {
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const picPoints = activePic.activeLayer.convertToPicCoords(x,y)
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const uiPos = convertCoordsFromPicToUI(picPoints.x,picPoints.y,activePic);
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ctx.fillRect(uiPos.x-5,uiPos.y-5,10,10);
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ctx.strokeRect(uiPos.x-4,uiPos.y-4,8,8);
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}
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}
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}
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}
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tool.eventHandlers ={
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mousedown(e) {
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if (e.button == 0) {
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let now = Date.now();
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let clickSpacing = now-mouseDownTime;
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mouseDownTime=now;
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if (clickSpacing < doubleClickGap) {
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doubleClickHandler(e);
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return;
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}
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const mousePos = convertCoordsFromUIToPic(e.offsetX,e.offsetY,activePic);
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layer = activePic?.activeLayer;
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if (!layer) return;
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let handles=controlPoints(0,0,layer.width,layer.height);
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dragHandler=null;
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for (let i=0;i<handles.length;i++) {
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const {x,y} = handles[i];
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const picPoints = layer.convertToPicCoords(x,y)
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//const uiPos = convertCoordsFromPicToUI(picPoints.x,picPoints.y,activePic);
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//if (max( abs(uiPos.x-e.offsetX), abs(uiPos.y-e.offsetY) ) <8 ) {
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if (max( abs(picPoints.x-mousePos.x), abs(picPoints.y-mousePos.y) ) <8 ) {
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dragHandler=rotateMode?rotateHandler:scaleHandlers[i];
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break;
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}
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}
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if (!dragHandler) {
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if ( mousePos.x >0 &&
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mousePos.x<=layer.width &&
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mousePos.y >0 &&
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mousePos.y<=layer.height
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) {
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dragHandler=translateHandler;
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}
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if (rotateMode) {
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let {x,y} = layer.convertToPicCoords(layer.rotationCenter.x,layer.rotationCenter.y);
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console.log({x,y,mousePos})
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if (max( abs(x-mousePos.x), abs(y-mousePos.y) ) <8 ) {
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dragHandler=translateCenterHandler;
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}
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}
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}
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if (dragHandler) {
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let center = layer.convertToPicCoords(layer.rotationCenter.x,layer.rotationCenter.y)
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mouseDownAngle= v2Angle(v2Sub(mousePos,center));
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mouseDownTransform=[...layer.transform];
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mouseDownPosition = {x:e.offsetX,y:e.offsetY}
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console.log({mouseDownAngle})
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moved=false;
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}
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}
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},
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mouseup(e) {
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},
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mousemove(e) {
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if ((e.buttons && 1) !== 1) dragStop();
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if (dragHandler) {
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if (!moved) {
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activePic.addUndoRecord(layer.undoTransformRecord());
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moved=true;
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}
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dragHandler(e);
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}
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tool.drawUI();
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},
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}
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function controlPoints (left, top, right, bottom) {
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const midX = (left+right)/2;
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const midY = (top+bottom)/2;
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return [
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{x:left, y:top},
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{x:right, y:top},
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{x:right, y:bottom},
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{x:left, y:bottom},
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{x:midX, y:top},
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{x:right, y:midY},
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{x:midX, y:bottom},
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{x:left, y:midY}
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]
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}
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function dragStop() {
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dragHandler=null;
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}
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function doubleClickHandler(e) {
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rotateMode=!rotateMode;
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tool.drawUI();
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}
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function scaleHandler(handle,anchor,position,lockX=false,lockY=false) {
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const newTransform=scaleTransformByHandle(handle,anchor,position,mouseDownTransform,lockX,lockY);
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layer.transform = newTransform;
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activePic.updateVisualRepresentation();
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}
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function translateHandler(e) {
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let dx = e.offsetX -mouseDownPosition.x
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let dy = e.offsetY -mouseDownPosition.y;
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let newTransform = [...mouseDownTransform];
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newTransform[4]+=dx;
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newTransform[5]+=dy;
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layer.transform=newTransform;
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activePic.updateVisualRepresentation();
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}
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function translateCenterHandler(e) {
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const mousePos = convertCoordsFromUIToPic(e.offsetX,e.offsetY,activePic);
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layer.rotationCenter= layer.convertFromPicCoords(mousePos.x,mousePos.y);
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activePic.updateVisualRepresentation();
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}
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function dragTopLeft(e) {
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const mouseCurrentPosition = convertCoordsFromUIToPic(e.offsetX,e.offsetY,activePic);
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scaleHandler({x:0,y:0},{x:layer.width,y:layer.height},mouseCurrentPosition);
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}
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function dragTopRight(e) {
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const mouseCurrentPosition = convertCoordsFromUIToPic(e.offsetX,e.offsetY,activePic);
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scaleHandler({x:layer.width,y:0},{x:0,y:layer.height},mouseCurrentPosition);
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}
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function dragBottomRight(e) {
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const mouseCurrentPosition = convertCoordsFromUIToPic(e.offsetX,e.offsetY,activePic);
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scaleHandler({x:layer.width,y:layer.height},{x:0,y:0},mouseCurrentPosition);
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}
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function dragBottomLeft(e) {
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const mouseCurrentPosition = convertCoordsFromUIToPic(e.offsetX,e.offsetY,activePic);
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scaleHandler({x:0,y:layer.height},{x:layer.width,y:0},mouseCurrentPosition);
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}
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function dragTop(e) {
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const mouseCurrentPosition = convertCoordsFromUIToPic(e.offsetX,e.offsetY,activePic);
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scaleHandler({x:layer.width/2,y:0},{x:layer.width,y:layer.height},mouseCurrentPosition,true);
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}
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function dragRight(e) {
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const mouseCurrentPosition = convertCoordsFromUIToPic(e.offsetX,e.offsetY,activePic);
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scaleHandler({x:layer.width,y:layer.height/2},{x:0,y:0},mouseCurrentPosition,false,true);
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}
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function dragLeft(e) {
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const mouseCurrentPosition = convertCoordsFromUIToPic(e.offsetX,e.offsetY,activePic);
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scaleHandler({x:0,y:layer.height/2},{x:layer.width,y:0},mouseCurrentPosition,false,true);
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}
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function dragBottom(e) {
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const mouseCurrentPosition = convertCoordsFromUIToPic(e.offsetX,e.offsetY,activePic);
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scaleHandler({x:layer.width/2,y:layer.height},{x:layer.width,y:0},mouseCurrentPosition,true);
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}
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function rotateHandler(e) {
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let center = layer.convertToPicCoords(layer.rotationCenter.x,layer.rotationCenter.y)
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let mousePos = convertCoordsFromUIToPic(e.offsetX,e.offsetY,activePic);
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let angle= v2Angle(v2Sub(mousePos,center));
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let angleDelta = angle-mouseDownAngle;
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layer.transform=[...mouseDownTransform];
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layer.rotate(angleDelta*RadiansToDegrees);
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activePic.updateVisualRepresentation();
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}
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return tool;
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})(); //end closure for transformTool
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